New K2 results peg 2007 OR10 as the largest unnamed body in our solar system and the third largest of the current roster of about half a dozen dwarf planets. The dwarf planet Haumea has an oblong shape that is wider on its long axis than 2007 OR10, but its overall volume is smaller.
Credit: Konkoly Observatory/Andrs Pl, Hungarian Astronomical Association/Ivn der, NASA/JHUAPL/SwRI
Dwarf planets tend to be a mysterious bunch. With the exception of Ceres, which resides in the main asteroid belt between Mars and Jupiter, all members of this class of minor planets in our solar system lurk in the depths beyond Neptune.
From Jet Propulsion Laboratory/NASA
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